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Hole in the sky. A rare phenomenon appeared over Międzyrzecz. Cavum – how is it made?

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A mysterious hole in the sky appeared over Międzyrzecz (Lubusz Voivodeship) on Tuesday morning. We received her photos on Kontakt 24. The phenomenon is called cavum. Under what conditions is it created?

On Contact 24 We received photos of an unusual view that the residents of Międzyrzecz (Lubusz Voivodeship) could admire on Tuesday morning.

Favorable conditions. How is cavum made?

The phenomenon that was visible over the Lubusz region is called cavum and is rare. It is a well-defined, usually circular, less often linear, hole in a thin layer of a highly supercooled medium- or high-level cloud. From inside the so-called hole, virga (precipitation that does not reach the earth’s surface) or a cirrus cloud falls out in the form of fibrous wisps. This phenomenon occurs when there are no sudden movements in the atmosphere and the air is clean and the temperature drops very low.

“Cavum viewed directly beneath it is most often circular, but from a greater distance it takes on an oval shape and increases in size over time,” we read in the study “New classification of clouds”, published in 2017.

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As tvnmeteo.pl forecaster Damian Zdonek explained, on Tuesday morning in western Poland there were meteorological conditions favorable for the formation of cavum. There was a layer of high cirrocumulus clouds, which, in addition to altocumulus clouds, is typical of this phenomenon. These clouds occur quite high above the ground, where the air temperature is approximately -30 to -20 degrees Celsius.

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Main photo source: Piotr/Kontakt 24



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